/* * Copyright (c) 2015 Cisco and/or its affiliates. * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at: * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ /* * ip/ip_packet.h: packet format common between ip4 & ip6 * * Copyright (c) 2008 Eliot Dresselhaus * * Permission is hereby granted, free of charge, to any person obtaining * a copy of this software and associated documentation files (the * "Software"), to deal in the Software without restriction, including * without limitation the rights to use, copy, modify, merge, publish, * distribute, sublicense, and/or sell copies of the Software, and to * permit persons to whom the Software is furnished to do so, subject to * the following conditions: * * The above copyright notice and this permission notice shall be * included in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ #ifndef included_ip_packet_h #define included_ip_packet_h #include <vppinfra/byte_order.h> #include <vppinfra/error.h> typedef enum ip_protocol { #define ip_protocol(n,s) IP_PROTOCOL_##s = n, #include "protocols.def" #undef ip_protocol } ip_protocol_t; /* TCP/UDP ports. */ typedef enum { #define ip_port(s,n) IP_PORT_##s = n, #include "ports.def" #undef ip_port } ip_port_t; /* Classifies protocols into UDP, ICMP or other. */ typedef enum { IP_BUILTIN_PROTOCOL_UDP, IP_BUILTIN_PROTOCOL_ICMP, IP_BUILTIN_PROTOCOL_UNKNOWN, } ip_builtin_protocol_t; #define foreach_ip_builtin_multicast_group \ _ (1, all_hosts_on_subnet) \ _ (2, all_routers_on_subnet) \ _ (4, dvmrp) \ _ (5, ospf_all_routers) \ _ (6, ospf_designated_routers) \ _ (13, pim) \ _ (18, vrrp) \ _ (102, hsrp) \ _ (22, igmp_v3) typedef enum { #define _(n,f) IP_MULTICAST_GROUP_##f = n, foreach_ip_builtin_multicast_group #undef _ } ip_multicast_group_t; /* IP checksum support. */ /* Incremental checksum update. */ typedef uword ip_csum_t; always_inline ip_csum_t ip_csum_with_carry (ip_csum_t sum, ip_csum_t x) { ip_csum_t t = sum + x; return t + (t < x); } /* Update checksum changing field at even byte offset from x -> 0. */ always_inline ip_csum_t ip_csum_add_even (ip_csum_t c, ip_csum_t x) { ip_csum_t d; d = c - x; /* Fold in carry from high bit. */ d -= d > c; ASSERT (ip_csum_with_carry (d, x) == c); return d; } /* Update checksum changing field at even byte offset from 0 -> x. */ always_inline ip_csum_t ip_csum_sub_even (ip_csum_t c, ip_csum_t x) { return ip_csum_with_carry (c, x); } always_inline ip_csum_t ip_csum_update_inline (ip_csum_t sum, ip_csum_t old, ip_csum_t new, u32 field_byte_offset, u32 field_n_bytes) { /* For even 1-byte fields on big-endian and odd 1-byte fields on little endian we need to shift byte into place for checksum. */ if ((field_n_bytes % 2) && (field_byte_offset % 2) == CLIB_ARCH_IS_LITTLE_ENDIAN) { old = old << 8; new = new << 8; } sum = ip_csum_sub_even (sum, old); sum = ip_csum_add_even (sum, new); return sum; } #define ip_csum_update(sum,old,new,type,field) \ ip_csum_update_inline ((sum), (old), (new), \ STRUCT_OFFSET_OF (type, field), \ STRUCT_SIZE_OF (type, field)) always_inline u16 ip_csum_fold (ip_csum_t c) { /* Reduce to 16 bits. */ #if uword_bits == 64 c = (c & (ip_csum_t) 0xffffffff) + (c >> (ip_csum_t) 32); c = (c & 0xffff) + (c >> 16); #endif c = (c & 0xffff) + (c >> 16); c = (c & 0xffff) + (c >> 16); return c; } /* Copy data and checksum at the same time. */ ip_csum_t ip_csum_and_memcpy (ip_csum_t sum, void *dst, void *src, uword n_bytes); always_inline u16 ip_csum_and_memcpy_fold (ip_csum_t sum, void *dst) { return ip_csum_fold (sum); } /* Checksum routine. */ ip_csum_t ip_incremental_checksum (ip_csum_t sum, void *data, uword n_bytes); #endif /* included_ip_packet_h */ /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */